EP2799801B1 - Dispositif et procédé de refroidissement de matériau en vrac - Google Patents

Dispositif et procédé de refroidissement de matériau en vrac Download PDF

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Publication number
EP2799801B1
EP2799801B1 EP12863238.7A EP12863238A EP2799801B1 EP 2799801 B1 EP2799801 B1 EP 2799801B1 EP 12863238 A EP12863238 A EP 12863238A EP 2799801 B1 EP2799801 B1 EP 2799801B1
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EP
European Patent Office
Prior art keywords
cement clinker
bed
cooling
cooling air
clinker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12863238.7A
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German (de)
English (en)
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EP2799801B2 (fr
EP2799801A1 (fr
EP2799801A4 (fr
Inventor
Hiroshi Bando
Noboru Ichitani
Isao Hayashi
Koichi DEI
Hiroaki OSAWA
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Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
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Application filed by Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Kawasaki Heavy Industries Ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/47—Cooling ; Waste heat management
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F27D15/022—Cooling with means to convey the charge comprising a cooling grate grate plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F27D15/022—Cooling with means to convey the charge comprising a cooling grate grate plates
    • F27D2015/0233—Cooling with means to convey the charge comprising a cooling grate grate plates with gas, e.g. air, supply to the grate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F27D2015/026—Means to discharge the fines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods

Definitions

  • the present invention relates to a device for cooling down a bed of a bulk material such as cement clinker while conveying the bed of the bulk material according to the pre-characterizing clause of claim 1 and to a respective method.
  • Patent Literatures 1 and 2 disclose a clinker cooling device provided subsequent to a kiln for firing cement raw meal.
  • the clinker cooling device feeds cooling air to an intermediate product (cement clinker) that is produced as a result of firing the cement raw meal, thereby rapidly cooling down the intermediate product.
  • the cement clinker is a granular material or a mass, whose grain diameter varies in the range of about 1 to 25 mm.
  • the cement clinker is fed from the kiln to the clinker cooling device sequentially.
  • the clinker cooling device conveys the cement clinker in the form of a bed. While conveying the cement clinker bed, the clinker cooling device continuously feeds cooling air to the cement clinker bed from below. In this manner, the cement clinker bed is cooled down while being conveyed. Meanwhile, the cooling air exchanges heat with the cement clinker, and is thereby heated up.
  • a technique of recovering heat from the heated air is utilized. In the technique, the heated air is used as combustion air in the kiln and a precalciner.
  • the height of the bed of the cement clinker tends to be increased in order to increase the amount of heat to recover per unit time.
  • the pressure of the cooling air needs to be increased.
  • the amount of power consumed by air blowers for feeding such cooling air has been increasing lately.
  • an object of the present invention is to improve energy efficiency when cooling down a bed of a bulk material while conveying the bed of the bulk material.
  • the inventors of the present invention conducted development of a device for and a method of cooling down a bed of a bulk material.
  • the inventors of the present invention obtained the following findings: if bulk material grains, in particular bulk material grains having widely varying grain diameters, are stacked randomly, then the bulk material grains that have small grain diameters gain entry between the bulk material grains that have large grain diameters. This may result in a high filling rate and cause an increase in pressure loss of the cooling air when the cooling air passes through the bulk material.
  • the inventors also obtained the following findings: since the bulk material grains that have large grain diameters are in contact with the bulk material grains that have small grain diameters, the heat exchange between the bulk material and the cooling air is not efficiently carried out, which may consequently cause degradation in the cooling performance and heat recovery performance of the bulk material cooling device. Based on these findings, the inventors have conceived an idea that if the filling rate of the bed of the bulk material is reduced, then there is a possibility that the pressure loss of the cooling air will be reduced and chances for the bulk material grains that have large grain diameters to come into contact with the cooling air will increase. The present invention has been made to achieve the aforementioned object, and is based on these findings and conceived idea.
  • a bulk material cooling device is a device for cooling down a bed of a bulk material while conveying the bed of the bulk material, and includes: a fine grain separating part configured to feed cooling air flowing upward to the bed of the bulk material, and by the cooling air, selectively separate fine grains in the bed of the bulk material to an upper side of the bed; and a rear-stage cooling part provided downstream from the fine grain separating part and configured to feed cooling air to the bed of the bulk material, the cooling air having a flow rate per unit area less than the flow rate per unit area of the cooling air fed at the fine grain separating part.
  • fine grains in the bed of the bulk material are selectively separated to the upper side of the bed. Accordingly, while the bulk material grains that have large grain diameters remain in the lower side of the bed, fine grains previously present between the bulk material grains that have large grain diameters are separated to the upper side of the bed. As a result, at the rear-stage cooling part, the filling rate in the lower side of the bed of the bulk material is reduced, and consequently, more portions of the surfaces of the bulk material grains that have large grain diameters become exposed to gaps. As a result, pressure loss of the cooling air when the cooling air flows upward and passes through the bed of the bulk material is reduced, and even if the cooling air is fed at a low pressure, the bulk material can be cooled down efficiently.
  • the bulk material Since chances for the bulk material grains that have large grain diameters to come into contact with the cooling air increase, the bulk material actively exchanges heat with the cooling air. Therefore, even if the flow rate per unit area of the cooling air is reduced, the bulk material can be cooled down efficiently, and thereby the cooling performance and the heat recovery performance of the bulk material cooling device are improved. Since the cooling air is utilized for the separation of fine grains, it is not necessary to additionally include a device dedicated for the separation of fine grains. In the above-described manner, the energy efficiency of the bulk material cooling device can be improved.
  • the bulk material cooling device may include a receiving part provided upstream from the fine grain separating part and configured to receive the bulk material.
  • the receiving part may constitute a front-stage cooling part configured to feed cooling air flowing upward to the bulk material.
  • the bulk material can be cooled down as rapidly as possible.
  • the filling rate can be reduced by means of the fine grain separating part, which is provided downstream from the front-stage cooling part. Therefore, at the front-stage cooling part, the setting of the cooling air can be made particularly intended for the cooling of the bulk material.
  • the fine grain separating part may be provided in a manner to immediately follow the receiving part, such that the fine grain separating part is continuous with the receiving part. According to this configuration, fine grains can be separated immediately after the bed of the bulk material is formed at the receiving part. In this manner, the fine grains are separated as early as possible to reduce the filling rate. Consequently, a wider area is covered by the rear-stage cooling part, and thereby energy efficiency is improved favorably.
  • the fine grain separating part may feed the cooling air to cause the bulk material to be in a state of immediately before start of fluidization of the fine grains. According to this configuration, only the fine grains can be efficiently separated to the upper side of the bed, and also, a situation where the fluidization progresses to cause unwanted increase in pressure loss or to cause degradation in heat exchange performance can be prevented from occurring.
  • the bulk material may be cement clinker.
  • the receiving part may receive the cement clinker from a kiln for sintering cement raw meal.
  • the grain diameter of the cement clinker varies relatively widely. Since the cement clinker fed to the receiving part is in the state of having a high temperature of about 1400 °C due to the firing in the kiln, the amount of heat that can be recovered from the cement clinker is significantly large. Therefore, functional advantages obtained from the separation of fine grains are significantly great.
  • a bulk material cooling method is a method of cooling down a bed of a bulk material while conveying the bed of the bulk material, and includes: a fine grain separating step of feeding cooling air flowing upward to the bed of the bulk material, and by the cooling air, selectively separating fine grains in the bed of the bulk material to an upper side of the bed; and a rear-stage cooling step of feeding cooling air to the bed of the bulk material after the fine grain separating step, the cooling air having a flow rate per unit area less than the flow rate per unit area of the cooling air fed in the fine grain separating step.
  • the fine grain separating step fine grains present between the bulk material grains that have large grain diameters can be separated. Therefore, in the rear-stage cooling step, the bulk material can be cooled down efficiently even if the pressure and the flow rate of the cooling air are low.
  • the present invention makes it possible to improve energy efficiency when cooling down a bed of a bulk material while conveying the bed of the bulk material.
  • Fig. 1 is a conceptual diagram showing a pyroprocessing facility 1 in a cement plant, the pyroprocessing facility 1 including a clinker cooling device 5 according to the embodiment of the present invention.
  • a raw material grinding step is a step of grinding a cement raw material.
  • the pyroprocessing step is a step of firing and rapidly cooling down the ground cement raw meal, and thereby granular or massive cement clinker is formed.
  • the finishing step is a step of crushing the cement clinker, and thereby cement as a final product is produced.
  • Fig. 1 schematically shows the pyroprocessing facility 1 for performing the pyroprocessing step in the cement plant.
  • Solid arrows indicate flows of the cement raw meal and cement clinker. Dotted arrows indicate flows of gas.
  • the pyroprocessing facility 1 inlcudes a preheater 2, a precalciner 3, a rotary kiln 4, and the clinker cooling device 5, which are sequentially connected in this order.
  • the preheater 2 includes multi-stage cyclones 6, in which a plurality of cyclones are arranged vertically. The second lowermost cyclone 6 is connected to the inlet of the precalciner 3.
  • the rotary kiln 4 is cylindrical, and its inlet and outlet are positioned at both axial ends of the rotary kiln 4, respectively.
  • the rotary kiln 4 is disposed so as to be inclined such that the outlet of the rotary kiln 4 is positioned lower than the inlet of the rotary kiln 4.
  • the rotary kiln 4 is rotatable around its central axis.
  • a burner 8 is provided at the outlet of the rotary kiln 4.
  • the burner 8 generates a high-temperature flame and combusted gas that are directed toward the inlet side of the rotary kiln 4.
  • the inlet of the rotary kiln 4 is connected to the outlet of the precalciner 3 and the lowermost cyclone 6.
  • the outlet of the rotary kiln 4 is connected to the clinker cooling device 5.
  • the cement raw meal While being conveyed downward in the preheater 2, the cement raw meal is preheated before being subjected to a calcination reaction.
  • the cement raw meal is guided from the preheater 2 to the precalciner 3, and calcined in the precalciner 3.
  • the cement raw meal is preheated and calcined by exchanging heat with exhaust gas from the rotary kiln 4 and combusted gas in the precalciner 3.
  • the exhaust gas from the rotary kiln 4 flows upward in the precalciner 3 and the preheater 2, and is discharged from the uppermost cyclone 6.
  • the preheated and calcined cement raw meal is fed to the inlet of the rotary kiln 4.
  • cement raw meal is sintered while being conveyed toward the outlet of the rotary kiln 4.
  • the sintered cement raw meal becomes granular or massive, and is discharged from the outlet of the rotary kiln 4 to be fed to the clinker cooling device 5.
  • cement clinker a cement intermediate product that has been discharged from the outlet of the rotary kiln 4 is called "cement clinker" until the cement intermediate product is subjected to the finishing step.
  • the clinker cooling device 5 is fed with the cement clinker discharged from the rotary kiln 4.
  • the clinker cooling device 5 conveys the fed cement clinker in the form of a bed, and while conveying the cement clinker bed, feeds cooling air to the cement clinker bed. In this manner, the cement clinker bed is rapidly cooled down from about 1400 °C to about the atmospheric temperature + 65 °C while being conveyed.
  • the cooling air is heated by exchanging heat with the cement clinker bed. Part of the heated air is fed to the precalciner 3 and the rotary kiln 4, and used as combustion air. Since the heat of the heated air is recovered at the precalciner 3 and the rotary kiln 4, the fuel consumption rate of the pyroprocessing facility 1 can be improved.
  • Fig. 2 is a perspective view of the clinker cooling device 5 shown in Fig. 1 . It should be noted that, in Fig. 2 , cement clinker 90 is not shown in the clinker cooling device 5 for the sake of convenience of the description. As shown in Fig. 2 , the clinker cooling device 5 is configured to be elongated in a direction in which the cement clinker 90 is conveyed (hereinafter, "conveyance direction").
  • the clinker cooling device 5 includes: a front-stage cooling part 101, a fine grain separating part 102 provided downstream from the front-stage cooling part 101 in the conveyance direction; and a rear-stage cooling part 103 provided downstream from the fine grain separating part 102 in the conveyance direction.
  • the clinker cooling device 5 includes: a receiving part 11 configured to receive the cement clinker 90 fed from the rotary kiln 4; and a moving part 12 extending downstream in the conveyance direction from the receiving part 11. First, the configurations of the receiving part 11 and the moving part 12 are described.
  • the receiving part 11 includes a fixed inclined grate 13 provided below the outlet of the rotary kiln 4.
  • the fixed inclined grate 13 includes an inclined surface 14.
  • the inclined surface 14 is inclined downward from a position below the outlet of the rotary kiln 4, and extends toward the moving part 12, which is positioned downstream in the conveyance direction.
  • the inclined surface 14 is formed in the shape of an isosceles trapezoid when seen in the normal direction to the inclined surface 14.
  • the width of the inclined surface 14 increases as descending from the upstream portion of the inclined surface 14 (i.e., the portion blow the outlet of the rotary kiln 4) toward the downstream portion of the inclined surface 14 (i.e., the portion connected to the moving part 12).
  • the receiving part 11 includes a pair of guide walls 15. The guide walls 15 extend upward from both sides of the inclined surface 14 in the width direction.
  • the cement clinker 90 discharged from the rotary kiln 4 drops onto the upstream portion of the inclined surface 14 of the fixed inclined grate 13.
  • a deposit 91 of the cement clinker 90 remains in a mound-like manner on the upstream portion of the inclined surface 14.
  • the cement clinker 90 dropping from the rotary kiln 4 slides over the deposit 91 and drops onto the inclined surface 14. Then, the cement clinker 90 rolls down along the inclined surface 14 and the guide walls 15 to the downstream portion of the inclined surface 14. Since the cement clinker 90 is caused to slide over the mound-like deposit 91, a large amount of cement clinker 90 discharged from the rotary kiln 4 can be evenly distributed in the width direction when fed to the moving part 12.
  • the moving part 12 includes: a plurality of movable floors 17, which are arranged in a direction perpendicular to the conveyance direction, the direction being different from the vertical direction (hereinafter, the direction is referred to as "the perpendicular direction"); and conveyance actuators 18 corresponding to the plurality of movable floors 17.
  • Each movable floor 17 includes a plurality of moving grates 19 arranged in the conveyance direction.
  • the plurality of moving grates 19 are fixed to an elongated frame 20, which is elongated in the conveyance direction.
  • the cement clinker bed fed from the receiving part 11 is supported on the plurality of movable floors 17.
  • the cement clinker bed is laid out on the plurality of movable floors 17 entirely in the conveyance direction and entirely in the perpendicular direction.
  • driving force in the conveyance direction is imparted to the frame 20 that corresponds to the conveyance actuators 18.
  • the frame 20 moves upstream or downstream in the conveyance direction, and the plurality of moving grates 19 fixed to the frame 20 move in the same direction at the same speed as the frame 20.
  • the movable floors 17 move in the conveyance direction in accordance with the operation of the conveyance actuators 18, and the cement clinker bed on the movable floors 17 is conveyed in accordance with the movement of the movable floors 17.
  • the movable floors 17 are configured to move by means of a so-called tandem-sliding system, thereby conveying the cement clinker bed.
  • the other movable floors 17 are caused to stay stationary.
  • the number of movable floors that are caused to move is less than the number of movable floors that are caused to stay stationary.
  • the movable floors that are caused to move are preferably not adjacent to each other.
  • the movable floors 17 that are caused to move are selected in such a manner, even though the selected movable floors 17, i.e., part of the movable floors 17, move, the entire cement clinker bed is supported by the other stationary movable floors 17 and thereby stays stationary. Meanwhile, the movable floors 17 that are caused to move return to their initial positions by slidingly move relative to the stationary cement clinker bed. Thereafter, the movable floors 17 that are still remaining at the downstream side in the conveyance direction are caused to return upstream in the conveyance direction in the same manner.
  • each cycle including the above-described steps e.g., each cycle including performing the forward moving step once and the returning step three times
  • the mere repetition of reciprocating movement of the movable floors 17 by the predetermined stroke causes the cement clinker bed to be conveyed downstream in the conveyance direction intermittently. It should be noted that even if the number of movable floors 17 is not six, the cement clinker bed can be conveyed in the same manner by means of the above-described tandem sliding system.
  • the cement clinker bed on the movable floors 17 is collectively conveyed downstream in the conveyance direction in the forward moving step.
  • the cement clinker flows from the receiving part 11 to the upstream end of the movable floors 17.
  • the cement clinker bed automatically and smoothly flows into the moving part 12.
  • the entire cement clinker bed tends to stay stationary while the movable floors 17 move upstream. Therefore, at the downstream end of the moving movable floors 17, the cement clinker that can no longer be supported by the movable floors 17 drops.
  • the cement clinker that drops in such a manner is collected and fed to the finishing step.
  • the moving part 12 is fed with the cement clinker in the forward moving step, and discharges the cement clinker in the returning step.
  • each moving grate 19 includes a box portion 21, which is substantially a rectangular parallelepiped and which is open upward.
  • the box portion 21 includes a bottom wall 22 supporting the cement clinker bed.
  • the cement clinker bed includes: a dead layer 93 contained inside each box portion 21; and a conveyed layer 94 layered on the rectangular frame-like upper end surface of each box portion 21 and the dead layer 93.
  • the dead layer 93 which is fully integrated with the box portions 21, moves downstream in the conveyance direction in the forward moving step. Meanwhile, the conveyed layer 94 is conveyed downstream in the conveyance direction although the conveyed layer 94 slides upstream in the conveyance direction relative to the box portions 21. In the returning step, the dead layer 93 fully integrated with the box portions 21 moves upstream in the conveyance direction. Meanwhile, the conveyed layer 94 does not follow the movement of the box portions 21. It can be considered that the dead layer 93 and the box portions 21 constitute the moving part 12. While the pyroprocessing facility 1 is in operation, the dead layer 93 remains on the box portions 21 in principle. It should be noted that, in the present embodiment, the height of the conveyed layer 94 is set to approximately 700 mm or greater.
  • slits 32 elongated in the width direction (perpendicular direction) of the inclined surface 14 are formed in the inclined surface 14 of the fixed inclined grate 13.
  • Slits 35 are formed in the bottom wall 22 of each of the moving grates 19. It should be noted that Fig. 3 shows the slits 35 being formed in only one of inclined surfaces of the bottom wall 22 and shows no slits being formed in the other inclined surfaces of the bottom wall 22. However, the slits are actually formed in the other inclined surfaces of the bottom wall 22 in the same manner.
  • cooling air is fed to the clinker on the fixed inclined grate 13.
  • cooling air is fed to high-temperature clinker positioned over the dead layer 93.
  • the clinker cooling device 5 includes: the front-stage cooling part 101; the fine grain separating part 102 provided downstream from the front-stage cooling part 101 in the conveyance direction; and the rear-stage cooling part 103 provided downstream from the fine grain separating part 102 in the conveyance direction.
  • the front-stage cooling part 101 is provided such that, in the conveyance direction, the front-stage cooling part 101 is positioned upstream from the boundary between the receiving part 11 and the moving part 12.
  • the receiving part 11 constitutes the front-stage cooling part 101.
  • the front-stage cooling part 101 includes the aforementioned fixed inclined grate 13 and a first cooling fan 41 provided in a space below the fixed inclined grate 13.
  • the first cooling fan 41 takes in air from the atmosphere, and pressure-feeds cooling air A1.
  • the cooling air A1 pressure-fed from the first cooling fan 41 vertically passes through the fixed inclined grate 13 from below, then fed to the cement clinker in the receiving part 11, and thereafter flows substantially upward.
  • the fine grain separating part 102 is provided between the aforementioned boundary, which lies between the receiving part 11 and the moving part 12, and a position that is away from the boundary toward the downstream side in the conveyance direction by a certain distance. That is, in the present embodiment, the fine grain separating part 102 is provided at the upstream end of the moving part 12 in the conveyance direction, such that the fine grain separating part 102 is continuous with, i.e., immediately follows, the front-stage cooling part 101.
  • the aforementioned certain distance is the length of the fine grain separating part 102 in the conveyance direction, the length corresponding to a few of the plurality of moving grates 19 arranged in the conveyance direction.
  • the cement clinker bed passes the fine grain separating part 102 by taking a time of about 1 to 2 minutes, for example.
  • the actual length of the fine grain separating part 102 in the conveyance direction is determined by taking account of the balance of the entire device.
  • the fine grain separating part 102 includes: the moving grates 19 that are included within the certain distance; and a second cooling fan 42 provided in a space below the moving grates 19.
  • the second cooling fan 42 takes in air from the atmosphere, and pressure-feeds cooling air A2.
  • the cooling air A2 pressure-fed from the second cooling fan 42 vertically passes through the moving grates 19 that correspond to the fine grain separating part 102 from below, then fed to the cement clinker bed on the movable floors 17, and thereafter flows substantially upward.
  • the rear-stage cooling part 103 is continuous with, i.e., immediately follows, the fine grain separating part 102.
  • the rear-stage cooling part 103 extends to reach the downstream end of the moving part 12 in the conveyance direction.
  • the fine grain separating part 102 and the rear-stage cooling part 103 constitute the moving part 12.
  • the rear-stage cooling part 103 includes: the moving grates 19 that are positioned downstream from the fine grain separating part 102 among the plurality of moving grates 19 arranged in the conveyance direction; and third cooling fans 43 provided in a space below these moving grates 19.
  • the rear-stage cooling part 103 since the rear-stage cooling part 103 is relatively long in the conveyance direction, the rear-stage cooling part 103 includes a plurality of third cooling fans 43.
  • the plurality of third cooling fans 43 are arranged such that they are spaced apart from each other in the conveyance direction. Each third cooling fan 43 takes in air from the atmosphere, and pressure-feeds cooling air A3. The cooling air A3 pressure-fed from each third cooling fan 43 vertically passes through the moving grates 19 that correspond to the third cooling fan 43 from below, then fed to the cement clinker bed on the movable floors 17, and thereafter flows substantially upward.
  • the first cooling fan 41, the second cooling fan 42, and the plurality of third cooling fans 43 are arranged from the receiving part 11 to the downstream portion of the moving part 12 in the conveyance direction, such that the fans are spaced apart from each other in the conveyance direction. While the plurality of movable floors 17 are in operation, the cooling fans 41 to 43 also continue operating.
  • the cooling air is continuously fed to the cement clinker bed, and thereby the cement clinker bed is rapidly cooled down.
  • the flow rate of the cooling air per unit area is substantially uniform in the perpendicular direction, showing almost no gradient. Accordingly, the cement clinker bed is cooled down as uniformly as possible in the perpendicular direction.
  • flow rate per unit area can be defined as the volume of the flowing cooling air per unit area per unit time [Nm 3 /m 2 ⁇ s] under standard conditions (0 °C, 1 atm).
  • the unit area can be calculated with reference to the plane area of the entire region assigned to each of the cooling fans 41 to 43.
  • the flow rate per unit area of the cooling air A2 at the fine grain separating part 102 is less than the flow rate per unit area of the cooling air A1 at the front-stage cooling part 101, but greater than the flow rate per unit area of the cooling air A3 at the rear-stage cooling part 103. Since the flow rate is varied from fan to fan in this manner, the clinker cooling device 5 provides special functional advantages as described below when cooling down the cement clinker bed while conveying the cement clinker bed.
  • the flow rate per unit area of the cooling air A1 at the front-stage cooling part 101 is set to be greater than the flow rate per unit area of the cooling air at the other parts (in particular, greater than the flow rate per unit area of the cooling air at the fine grain separating part 102). Accordingly, the cement clinker fed from the rotary kiln 4 is cooled down as rapidly as possible. As previously described, the cement clinker bed is evenly distributed in the width direction by means of the deposit 91. Therefore, at the receiving part 11, the height of the cement clinker bed can be stabilized in the width direction. Moreover, if the flow rate is great, the Coanda effect of the cooling air A1 is exerted favorably when the cooling air A1 passes through the fixed inclined grate 13.
  • the cement clinker bed with the stable height can be fed to the moving part 12 automatically and smoothly along the inclined surface 14. While the plurality of movable floors 17 are in operation, the above-described functions are exerted continuously. As a result, the height of the cement clinker bed fed to the moving part 12 is stabilized in both the conveyance direction and the perpendicular direction. This makes it possible to reduce uneven cooling of the cement clinker bed.
  • Fig. 4A is a schematic diagram showing the state of the cement clinker immediately after the cement clinker is fed from the front-stage cooling part 101 to the fine grain separating part 102.
  • Fig. 4B is a schematic diagram showing the state of the cement clinker immediately after the cement clinker is fed from the fine grain separating part 102 to the rear-stage cooling part 103. That is, at the fine grain separating part 102, the state of the cement clinker changes from the one shown in Fig. 4A to the one shown in Fig. 4B .
  • the grain diameter of the cement clinker widely varies in the range of 1 mm to 25 mm.
  • the cement clinker bed becomes a state where the cement clinker grains with various grain diameters are mixed together, while the cement clinker bed is rapidly cooled down.
  • the cement clinker bed Immediately after being fed to the fine grain separating part 102, the cement clinker bed, at least the conveyed layer 94, is in such a state.
  • the cement clinker grains with various grain diameters When the cement clinker grains with various grain diameters are mixed together in the bed in this manner, the cement clinker grains that have small grain diameters gain entry between the cement clinker grains that have large grain diameters. Consequently, the filling rate of the conveyed layer 94 in its height direction remains at a substantially constant high value. Meanwhile, the cooling air A2 from the second cooling fan 42 passes through gaps formed between the surfaces of the cement clinker grains, thereby flowing substantially upward inside the cement clinker bed. If the filling rate is high (i.e., if the gaps are narrow), pressure loss of the cooling air A2 when the cooling air A2 passes through the cement clinker bed (hereinafter, the pressure loss is referred to as "clinker-passing pressure loss”) becomes great.
  • the cooling air that flows substantially upward is fed to the cement clinker bed, and by utilizing the cooling air A2, fine grains among the grains in the cement clinker bed are selectively separated to the upper side of the bed.
  • the second cooling fan 42 pressure-feeds the cooling air A2, which has a pressure and flow rate necessary for selectively pushing up the fine grains to the upper side of the bed.
  • the fine grains are moved to the upper side of the bed in such a manner that the fine grains together with the cooling air A2 pass through the gaps between the other cement clinker grains, or in such a manner that the fine grains pushed by the cooling air A2 push away the other cement clinker grains.
  • the powder and granular material bed transitions from a fixed bed through a minimum fluidized bed and a uniform fluidized bed into a bubbling fluidized bed in this order. If the flow rate is further increased, then slugging, turbulent fluidization, and fast fluidization occur in this order.
  • the grain diameter of a powder and granular material increases, then the flow rate necessary for realizing the same fluidized state increases (e.g., a uniform fluidized state, a bubbling fluidized state, or a slugging state). In other words, the less the grain diameter, the faster the transition into such a fluidized state as mentioned above.
  • the wording "state of immediately before becoming fluidized” refers to, at least, a state of immediately before transitioning into a bubbling fluidized bed, preferably, a state of immediately before becoming uniform-fluidized or minimum-fluidized.
  • the flow rate of the cooling air A2 is preferably set to be less than, at least, the bubble generation rate of the cement clinker grains that have the maximum grain diameter among the fine grains to be separated. The reason for this is that if the fluidization of the cement clinker is accelerated to such a degree as to cause bubbling fluidization, then the clinker-passing pressure loss becomes significantly great, which causes a necessity to increase the pressure of the cooling fan.
  • the flow rate of the cooling air is set to such a flow rate as not to cause bubbling fluidization and uniform fluidization of the cement clinker. With such setting, the pressure and flow rate of the cooling air are prevented from becoming unnecessarily high; the cement clinker can be cooled down efficiently; and heat can be efficiently recovered from the cement clinker.
  • the selection of the size of the fine grains to be separated is not particularly limited, so long as the size is selected within a range that allows an effect described below (i.e., reduction of the filling rate in the lower side of the bed) to be obtained.
  • the fine grains may be, among the cement clinker grains contained in the cement clinker bed on the movable floors 17, the cement clinker grains that have a grain diameter of about 6 mm or less.
  • the fine grains may account for 20 to 30 % of the cement clinker grains contained in the cement clinker bed on the movable floors 17 in terms of cumulative percentage by weight.
  • the grain size distribution of the cement clinker varies in accordance with the composition and other conditions of the cement raw material.
  • Fig. 5 shows one example of the grain size distribution in a conceptual manner.
  • fine grains having a grain diameter of 6 mm or less account for about 25 % of the total cement clinker grains in terms of cumulative percentage by weight.
  • the inventors of the present invention conducted an experiment.
  • Causing the fine grains to be in the state of immediately before becoming fluidized and selectively separating the fine grains to the upper side of the bed is substantially the same in meaning as selectively keeping the cement clinker grains that have large grain diameters in the lower side of the bed as a fixed bed.
  • Fig. 4B as a result of the fine grain separation, fine grains previously present between the cement clinker grains that have large grain diameters are eliminated from the lower side of the bed, while the cement clinker grains that have large grain diameters remain in the lower side of the bed. As a result, the filling rate is reduced in the lower side of the bed.
  • the separation of the fine grains is realized by feeding the cooling air A2. Therefore, the cement clinker, which is fed with the cooling air A2, is cooled down favorably.
  • the clinker-passing pressure loss of the cooling air A3 fed from the third cooling fan 43 is relatively small. For this reason, at the rear-stage cooling part 103, even if the pressure of the cooling air A3 is low, the cooling air A3 easily passes through the cement clinker bed, and the cement clinker bed can be suitably cooled down. In the lower side of the bed, owing to the reduction in the filling rate, more portions of the surfaces of coarse grains become well exposed to the gaps. As a result, chances for the coarse grains to come into contact with the cooling air A3 increase, which allows the coarse grains to efficiently exchange heat with the cooling air A3.
  • the flow rate of the cooling air A3 is set to the aforementioned numerical value, even if the flow rate of the cooling air A3 is set to, for example, 0.6 to 0.8 [Nm 3 /m 2 ⁇ s], the cement clinker bed can be cooled down to an intended temperature as necessary.
  • the flow rate of the cooling air A1 can be set to, for example, 1.60 to 1.55 [Nm 3 /m 2 ⁇ s].
  • the clinker cooling device 5 is configured such that, in order to reduce the filling rate of at least part of the cement clinker bed, the flow rate of the cooling air is locally increased, and thereby fine grains are separated to the upper side of the bed. In this manner, the pressure and the flow rate of the cooling fans can be reduced as a whole, and yet the cement clinker can be cooled down similarly to conventional art. As a result, the cooling performance and the heat recovery performance of the clinker cooling device 5 are improved. Accordingly, the energy efficiency of the clinker cooling device 5 is improved. Consequently, the fuel consumption rate of the entire facility performing the pyroprocessing step is improved favorably.
  • the setting of the cooling air can be made particularly intended for the cooling of the cement clinker, and thereby the cement clinker can be suitably cooled down immediately after the cement clinker is discharged from the rotary kiln 4.
  • a cooling air feeding part configured to feed cooling air at a flow rate that is insufficient for separating fine grains may be provided between the receiving part 11 and the fine grain separating part 102.
  • the filling rate reduction through the fine grain separation is achieved as upstream as possible in the conveyance direction. As a result, cooling efficiency is improved favorably.
  • a typical two-story moving part includes: an upper story extending downstream in the conveyance direction from the receiving part; and a lower story extending downstream in the conveyance direction from right below the downstream end of the upper story in the conveyance direction.
  • the fine grain separating part 102 may be provided not only on the upper story at its portion immediately following the receiving part, but also on the lower story at its upstream end portion in the conveyance direction. (These positions are both located downstream from the receiving part.)
  • the fine grain separating part 102 may be provided with a plurality of second cooling fans 42, and the plurality of second cooling fans 42 may be arranged in the conveyance direction. In this case, the flow rates of the respective second cooling fans 42 may be different from each other, so long as each flow rate is in a range necessary for separating fine grains.
  • the plurality of third cooling fans 43 provided in the rear-stage cooling part 103 may be configured to pressure-feed the cooling air at the same flow rate, or at different flow rates from each other. The same is true of the first cooling fan 41.
  • the number of cooling fans provided in the perpendicular direction is one.
  • a plurality of cooling fans may be arranged in the perpendicular direction.
  • the cement clinker may be conveyed not by means of a tandem sliding system but by means of a so-called pendular sliding system, for example.
  • the structures of the fixed inclined grate 13 and the moving grates 19 as well as the manner of ejecting the cooling air are not limited to the above-described ones. It should be noted that although the separation of fine grains may be performed differently from the above-described manner, the use of cooling air flowing upward is useful, because in this a case, it is not necessary to additionally include a device dedicated for the separation of fine grains.
  • the bulk material cooling device is suitably applicable to any device, so long as the device is configured to: convey a bed of a bulk material; and feed cooling air that flows substantially upward to cool down the bed of the bulk material while conveying the bed of the bulk material.
  • the present invention is suitably applicable particularly to clinker cooling devices.
  • the present invention provides a functional advantage of being able to improve energy efficiency when cooling down a bed of a bulk material while conveying the bed of the bulk material, and is useful when applied to a clinker cooling device included in a pyroprocessing facility of a cement plant.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Details (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Claims (3)

  1. Dispositif de refroidissement de scories de ciment (5) destiné à refroidir un lit de scories de ciment (90) évacué d'un four (4) tout en transportant le lit de scories de ciment (90), le dispositif de refroidissement de scories de ciment comprenant :
    une partie de séparation des grains fins (102) configurée pour apporter de l'air de refroidissement selon un écoulement ascendant au lit de scories de ciment, et sous l'effet de l'air de refroidissement, séparer sélectivement les grains fins du lit de scories de ciment vers un côté supérieur du lit, et
    une partie de refroidissement postérieure (103) prévue en aval de la partie de séparation des grains fins (102) et configurée pour apporter de l'air de refroidissement au lit de scories de ciment, l'air de refroidissement ayant un débit par unité de surface qui est inférieur au débit par unité de surface de l'air de refroidissement apporté à la partie de séparation des grains fins ;
    caractérisé par :
    une partie de réception (11) prévue en amont de la partie de séparation des grains fins (102) et configurée pour recevoir les scories de ciment (90),
    ladite partie de réception constituant une partie de refroidissement antérieure (101) configurée pour apporter de l'air de refroidissement selon un écoulement ascendant aux scories de ciment (90).
  2. Dispositif de refroidissement de scories de ciment (5) selon la revendication 1, dans lequel
    la partie de séparation des grains fins (102) est prévue de manière à faire immédiatement suite à la partie de réception (11), de manière que la partie de séparation des grains fins (102) est continue à la partie de réception (11).
  3. Procédé de refroidissement de scories de ciment destiné à refroidir un lit de scories de ciment (90) évacué d'un four (4) tout en transportant le lit de scories de ciment (90), le procédé comprenant :
    une étape de refroidissement antérieure consistant à apporter de l'air de refroidissement selon un écoulement ascendant aux scories de ciment (90) reçues par une partie de réception (11),
    une étape de séparation des grains fins consistant à apporter de l'air de refroidissement selon un écoulement ascendant au lit de scories de ciment (90), et sous l'effet de l'air de refroidissement, séparer sélectivement les grains fins du lit de scories de ciment (90) vers un côté supérieur du lit après l'étape de refroidissement antérieure, et
    une étape de refroidissement postérieure consistant à apporter de l'air de refroidissement au lit de scories de ciment (90) après l'étape de séparation des grains fins, l'air de refroidissement ayant un débit par unité de surface qui est inférieur au débit par unité de surface de l'air de refroidissement apporté à la partie de séparation des grains fins.
EP12863238.7A 2011-12-26 2012-12-21 Dispositif et procédé de refroidissement de matériau en vrac Active EP2799801B2 (fr)

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JP2011282986A JP5866196B2 (ja) 2011-12-26 2011-12-26 バルク材冷却装置及びバルク材冷却方法
PCT/JP2012/008197 WO2013099186A1 (fr) 2011-12-26 2012-12-21 Dispositif et procédé de refroidissement de matériau en vrac

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CN105180662B (zh) * 2015-08-07 2017-05-24 天津水泥工业设计研究院有限公司 一种高温颗粒状物料分级冷却方法及装置
CN105546976B (zh) * 2016-01-07 2017-07-14 湖南大学 一种篦式冷却机
WO2020058874A1 (fr) * 2018-09-18 2020-03-26 Material Handling System Industry S.R.L. Installation de récupération de laitier blanc résultant d'un traitement du fer et de l'acier
BE1027677B1 (de) * 2019-10-14 2021-05-10 Thyssenkrupp Ind Solutions Ag Verfahren und Kühler zum Kühlen von Schüttgut, insbesondere Zementklinker

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EP2799801B2 (fr) 2023-10-04
TWI495550B (zh) 2015-08-11
WO2013099186A1 (fr) 2013-07-04
JP2013133953A (ja) 2013-07-08
MY167643A (en) 2018-09-21
CN104011492A (zh) 2014-08-27
EP2799801A1 (fr) 2014-11-05
CN104011492B (zh) 2016-03-30
EP2799801A4 (fr) 2015-08-19
TW201334934A (zh) 2013-09-01
DK2799801T3 (en) 2017-07-17
JP5866196B2 (ja) 2016-02-17
DK2799801T4 (da) 2023-11-06

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